How to disable second monitor in linux?

Question

linux

The cable is bent in the laptop, so he thinks that a vga display is connected to it, this interferes with the system. There is a funny bug in KDE, if an external monitor is connected, then the login takes about 30 seconds.
How to turn off the second monitor?

Answer 1

You can use xrandr to see what video output ports you have and are enabled.
For example, you have LVDS1 and VGA1. The task is to turn off the output on LVDS1:
xrandr --output LVDS1 --off --output VGA1 --auto